drupal 7 styling the ajax throbber and progress bar

Can I style Drupal's AJAX Throbber and Progress Bar? What are the classes or ids to overwrite?

Css styles you can use to theme the throbber:

• .ajax-progress-throbber
• .ajax-progress-throbber .message
• .ajax-progress-throbber .throbber

Also, take a look at this post.